我怎样才能把逗号放在几千位？

Question

`$.ajax({
                url : "/selectList.do",
                data:{memberNo:memberNo},                   
                success : function(list){
                    console.log(list);
                    for(let i=0;i<list.length;i++){
                             list[i].NUMBER;
                    }
                  }
            });`

我从 ajax 得到了数字，我想在这个数字中加上一个逗号（以千为单位）。

我该怎么做？

Answer 1

尝试使用 regex

const thousands = (o) => o.toString().replace(/\B(?<!\.\d*)(?=(\d{3})+(?!\d))/g, ',');

console.log(thousands(123456789));
console.log(thousands(123456789.123));

或使用Number.prototype.toLocaleString()

const num = 123456.789;

console.log(num.toLocaleString());

或使用Intl.NumberFormat

const number = 123456.789;
const nf = new Intl.NumberFormat('en-US');

console.log(nf.format(number));

或使用Array.prototype

const insert = (arr, index, newItem) => [
  ...arr.slice(0, index),
  newItem,
  ...arr.slice(index)
];

const thousands = (o) => {
  let tmpArr = o.toString().split('.');
  let splitArr = tmpArr[0].split('');
  const reversed = splitArr.reverse();
  for (let i = 1; i <= reversed.length; i++) {
    if (i % 3 == 0)
      splitArr = insert(splitArr, i, ',');
  }
  tmpArr[0] = tmpArr.length > 1 ? '.' : '';
  return splitArr.reverse().concat(tmpArr).join('');
};

console.log(thousands(123456));
console.log(thousands(123456.789));

我怎样才能把逗号放在几千位？

how can i put commas in thousands?

javascript

ajax